At first this just felt like a gamble, because of the way you get random towers most of the time, but then I realised how to get a proper economy going and found the game actually has strategic depth. Not a huge amount---you basically just need to go all-in on boosting shop prices and completing quests while making sensible choices when you can't do either of those. Beyond that, all the towers, mobs, and bosses are so characterful in just 8-by-8 pixels.
My progress: finished a 0-damage run with 27,152 coins, 22 quests, and 15 legendaries